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After being institutionalized in a mental hospital, Korean teen Su-mi (Yum Jung-ah) reunites with her beloved sister, Su-yeon (Im Soo-jung), and they return to live at their country home. The girls' widower father (Moon Geun-young) has remarried, and the siblings are immediately resentful of his new wife, Eun-joo (Kim Kap-soo). As Su-mi and Su-yeon try to resume their regular lives, strange events plague the house, leading to surprising revelations and a shocking conclusion. Wikipedia